Major Jtable help needed

Question

Hello all,
i am trying to extend the JTable class to create a table in which i can enter numbers. I would also like to channge the default renderer so i can change the colours of the cell lines. Aslo, i would like to add colum headers and row headers. I want the colum and row headers to be namesd after the dimensions passed to the new Table class. This may seem trivial to some, but i cant seem to get it going. I know i should have to extend the abstract table model, but i dont know what to put into it.
The only bit of code i have got going so far which definatly works in the class definition. I cant seem to find any good documentation about how to do the abogve...the sun tutorial only confuses me..could anyone please please help.
Thanks in advance, regards, Rupesh
public class SpreadTable extends JTable {
     private CellRenderer _renderer;
     public SpreadTable(int x, int y){
          super(x,y);
          setCellSelectionEnabled(true);
  public boolean isCellEditable(int row, int column) {return true;}

Answer 1

Hi - thanks for your post. I would be eager to see some of your furure results. I have been trying to get my Table to have editable cells, and trying to get the cells to be of a different size, and colour, and have finally come up with some code, but it doesnt seem to work. This error i get is
.\SpreadTable.java:58: cannot resolve symbol
symbol : method getTableCellRendererComponent (SpreadTable.CellRenderer,java.l
ng.Object,boolean,boolean,int,int)
location: class javax.swing.JLabel
super.getTableCellRendererComponent(this, value, isSelected, ha
Focus, row, column);
^
1 error
Here is the code.
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class SpreadTable extends JTable {
     private CellRenderer renderer;
     public SpreadTable(int x, int y){
          super(x,y);
          setCellSelectionEnabled(true);
          renderer = new CellRenderer();
          try {
         setDefaultRenderer(Class.forName("java.lang.Object" ), renderer );
     } catch (ClassNotFoundException ex) {
         System.out.println("SpreadSheet() Can't modify renderer");
     TableColumn       aColumn   = getColumnModel().getColumn(0);
     TableCellRenderer aRenderer = getTableHeader().getDefaultRenderer();
    Component aComponent = aRenderer.getTableCellRendererComponent(this,
                                          aColumn.getHeaderValue(),
                                          false, false, -1, 0);
  public boolean isCellEditable(int row, int column) {return true;}
   public class CellRenderer extends JLabel implements TableCellRenderer  {
      private LineBorder  selectBorder;
      private EmptyBorder emptyBorder;
      private Dimension   dim;
      public CellRenderer() {
     super();
     emptyBorder  = new EmptyBorder(1, 2, 1, 2);
     selectBorder = new LineBorder(Color.red);
     setOpaque(true);
     setHorizontalAlignment(SwingConstants.CENTER);
     dim = new Dimension();
     dim.height = 22;
     dim.width  = 100;
     setSize(dim);
      public Component getTableCellRendererComponent (JTable table, Object value,
                                    boolean isSelected,
                                    boolean hasFocus,
                                    int row, int column) {
          super.getTableCellRendererComponent(this, value, isSelected, hasFocus, row, column);
          if (isSelected) {
       setBorder(selectBorder);
     } else {
       setBorder(emptyBorder);
     return this;
}